Stanford products Bob Bryan and Mike Bryan, arguably the top doubles team in tennis history, withdrew from the 2016 Rio Olympics, citing health concerns.
Bob Bryan revealed the decision on his Facebook page over the weekend, writing: "After countless hours of deliberation, Mike and I have decided to forego the Rio Olympics. Though we'd love to compete again, as husbands and fathers, our family's health is now our top priority."
The Bryan twins were scheduled to compete in their fourth Olympics. They won the gold medal at the 2012 London Olympics and also own a bronze medal.
Mike Bryan added a bronze medal, with Lisa Raymond, in mixed doubles.
The Bryan's made their decision after losing in the quarterfinals of the Rogers Cup in Montreal.
Tennis and golf, in particular, have seen multiple withdrawals and announced non-participation. Stanford grad and USA water polo captain Tony Azevedo, a Rio de Janeiro native, revealed his wife will not attend the Games due to health reasons.
The Bryan brothers, currently ranked fourth in doubles, had been ranked No. 1 consecutively from Feb. 25, 2013 through Oct. 26, 2015 (also Nov. 30, 2009 through April 30, 2012) and have been in the top 10 consecutively since they were No. 13 on Aug. 26, 2002.
They have held the top ranking for at least a year consecutively on four separate occasions, with the others being from Nov. 7, 2005 through Jan. 15, 2007 and again from April 16, 2007 to June 23, 2008.
The 38-year-olds, in their 19th season as pros, have won 112 career titles together and have a 991-305 record.
Mike Bryan has 114 career titles and is 1,005-308 overall.
Stanford grad Scott Lipsky is ranked No. 40 in doubles.